diff --git a/Src/lwip.c b/Src/lwip.c
index 7b3931f..5396dbd 100644
--- a/Src/lwip.c
+++ b/Src/lwip.c
@@ -134,7 +134,9 @@ void MX_LWIP_Init(void)
 /* USER CODE BEGIN 3 */
   if (!netif_is_up(&gnetif)){
     netif_set_up(&gnetif);
-    dhcp_start(&gnetif);
+    if (dhcp_start(&gnetif) == ERR_ARG){
+      NVIC_SystemReset(); /* 软复位 */
+    }
   }
 
 /* USER CODE END 3 */